Chairs and seats – Back movement resiliently opposed in operating position – Back and seat adjust simultaneously
Patent
1980-10-03
1982-12-07
McCall, James T.
Chairs and seats
Back movement resiliently opposed in operating position
Back and seat adjust simultaneously
248575, 248576, 297285, 297299, A47C 300
Patent
active
043623352
ABSTRACT:
A chair provided with a seat carrier and an associated backrest carrier includes a pneumatic spring connected between the seat carrier and backrest carrier, and a mechanical draw spring one end of which is connected directly to the backrest carrier and the other end of which is connected to an adjustable lever pivotally mounted on the seat carrier. The pneumatic spring and mechanical spring are disposed in side-by-side parallel relation to one another between a pair of generally vertical spaced bars forming a portion of the backrest carrier. The force exerted by the mechanical spring is in opposition to the restoring force exerted by the backrest carrier so that movement of the lever to increase the force exerted by the mechanical spring reduces the total restoring force exerted on the backrest carrier.
REFERENCES:
patent: 3572828 (1971-03-01), Lerner
patent: 3761045 (1973-09-01), Sturhan
patent: 3806075 (1974-04-01), Sturhan
patent: 3912248 (1975-10-01), Pickford et al.
patent: 4065176 (1977-12-01), Fontana
Drabert Fritz
von Waldegge Ulrich H.
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